MotoService Log
MZ ES / TS / ETZ
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MZ · Two-stroke single, premix, chain drive

ES / TS / ETZ

Library entry covers 1956-1998

15 factory 43 guideline

Published source

Betriebsanleitung fuer MZ-Motorraeder ES 125 und ES 150 (VEB Motorradwerk Zschopau, transcription)

Factory owner's handbook. Covers ES 125 / ES 150 (1960s).

Open the source

58 items for a 1986 model, grouped by interval the way a factory chart is laid out.

How this bike is built (what the schedule is based on)
Engine cycle
Two-stroke
Engine lubrication
Two-stroke premix (oil in fuel)
Oil filtration
None (no filter)
Valve gear
None (two-stroke porting)
Ignition
Magneto (incl. magdyno, flywheel magneto)
Charging
Alternator / stator with rectifier
Battery
Wet cell (flooded lead-acid, needs topping up)
Fuel system
Single carburetor
Cooling
Air / oil cooled
Primary drive
Gear or chain inside engine, shares engine oil
Gearbox oil
Separate gearbox oil
Clutch control
Hand lever, cable
Final drive
Chain
Front suspension
Telescopic fork
Rear suspension
Swingarm, twin shocks
Front brake
Drum (or band / stirrup)
Rear brake
Drum (or band / belt rim)
Wheels
Spoked, tubed
Sidecar
No sidecar
Maintenance schedule

1986 MZ ES / TS / ETZ

On the road: every 150 mi

1 item
  • Check two-stroke oil tank / carry premix oil
    Pre-ride / on the road
    Guideline

    Running a two-stroke out of oil seizes it. Injection bikes: check the tank. Premix: carry oil and a measure.

On the road: every 300 mi

2 items
  • Check lights, horn, brake light switches
    Pre-ride / on the road
    Guideline
  • Check tire pressures
    Pre-ride / on the road
    Guideline

On the road: every 621 mi

2 items
  • Check chain slack and rear wheel alignment
    Pre-ride / on the road
    Factory

    Manual: Kettendurchhang ueberpruefen. Factory: Sec 6.9.1

  • Lubricate drive chain
    Pre-ride / on the road
    Factory

    Manual: Kette 20-25 Tropfen Motorenoel. Factory: Through enclosed chain cases. Sec 6.9.2

Every 621 mi

2 items
  • Clean / inspect air filter
    Fuel and air
    Factory

    Manual: Trockenluftfilter reinigen (ausklopfen). Factory: 1,000-2,000 km depending on roads. Air filter section

  • Check gearbox oil level
    Primary and gearbox
    Factory

    Manual: Getriebeoelstand kontrollieren. Factory: Before long trips, at latest every 1,000 km. Sec 6.2

Every 1,000 mi or 6 months

3 items
  • Adjust front drum brake
    Brakes
    Guideline
  • Adjust rear drum brake and rod / cable linkage
    Brakes
    Guideline
  • Inspect tire tread, sidewalls and date codes
    Wheels and tires
    Guideline

Every 1,243 mi

3 items
  • Inspect, clean and gap spark plugs
    Engine
    Factory

    Manual: Zuendkerze reinigen, 0,6 mm. Factory: At least every 2,000 km, wire brush. Sec 6.6

  • Check battery electrolyte, top up with distilled water
    Ignition and electrics
    Factory

    Manual: Saeurestand pruefen, destilliertes Wasser. Factory: Acid density checked every 5,000 km. Battery section

  • Clean and gap contact breaker points, oil cam felt
    Ignition and electrics
    Factory

    Manual: Unterbrecherkontakte pruefen, Schmierfilz oelen. Factory: 2-3 drops hypoid oil on cam felt. Sec 6.6

Every 2,000 mi or 12 months

1 item
  • Replace spark plugs (two-stroke)
    Engine
    Guideline

Every 3,000 mi or 12 months

10 items
  • Check throttle cable(s) free play and return
    Fuel and air
    Guideline
  • Clean fuel tap filter / sediment bowl
    Fuel and air
    Guideline
  • Check / set ignition timing
    Ignition and electrics
    Guideline
  • Clean drive chain thoroughly (remove and soak, re-lube)
    Final drive
    Guideline

    Non O-ring chains on old machines: remove, clean, soak in hot chain grease or lube, refit with the master link clip closed end leading.

  • Check steering head bearing adjustment
    Front end
    Guideline
  • Inspect fork seals, stanchions and fork boots
    Front end
    Guideline
  • Check footrests, pegs, rear brake and gear lever pivots
    Rear suspension and frame
    Guideline
  • Grease and check center / side stand and springs
    Rear suspension and frame
    Guideline
  • Check spoke tension and wheel true
    Wheels and tires
    Guideline
  • Check wheel bearings for play
    Wheels and tires
    Guideline

Every 3,107 mi

3 items
  • Decarbonize exhaust ports, pipes and baffles
    Engine
    Factory

    Manual: Auslasskanal auf Verbrennungsrueckstaende kontrollieren. Factory: After about 5,000 km if power drops. Sec 6.4

  • Inspect wiring, bullet connectors and ground points
    Ignition and electrics
    Factory

    Manual: Kabelschuhe auf festen Sitz pruefen. Factory: Regulator and coil connections. Sec 6.6

  • Lubricate brake cam spindles, check linings and drums
    Brakes
    Factory

    Manual: Bremsen saeubern, Drehbolzen schmieren. Factory: Clean drums, chamfer linings, grease cams. Sec 6.9.5

Every 4,000 mi or 12 months

1 item
  • Adjust clutch free play, lubricate cable and lever pivot
    Primary and gearbox
    Guideline

Every 6,000 mi or 12 months

6 items
  • Clean carburetor float bowl(s), check float level and jets
    Fuel and air
    Guideline

    Ethanol fuel varnishes old carbs quickly in storage.

  • Check charging voltage and regulator / cut-out
    Ignition and electrics
    Guideline
  • Check swingarm bushes for play
    Rear suspension and frame
    Guideline
  • Inspect rear shocks for leaks and damping
    Rear suspension and frame
    Guideline
  • Lubricate control cables and lever pivots
    Controls and cables
    Guideline
  • Lubricate speedometer / tachometer cables, check drive
    Controls and cables
    Guideline

    A dry speedo cable whips the needle and eventually kills the instrument.

Every 6,000 mi or 2 years

2 items
  • Lubricate and check automatic advance unit
    Ignition and electrics
    Guideline
  • Magneto: clean slip ring and pickup brush, check HT lead
    Ignition and electrics
    Guideline

Every 6,214 mi

5 items
  • Replace spark plugs
    Engine
    Factory

    Manual: Neue Zuendkerze. Factory: Sec 6.6

  • Replace air filter element
    Fuel and air
    Factory

    Manual: Papiereinsatz erneuern. Factory: Wartungsplan text says 15,000 km; prose says 10,000. Air filter section

  • Inspect generator brushes and commutator
    Ignition and electrics
    Factory

    Manual: Lichtmaschine und Regler pruefen lassen. Factory: Brushes, commutator, regulator at a workshop. Sec 6.6

  • Change gearbox oil
    Primary and gearbox
    Factory

    Manual: Getriebeschmiermittel erneuern. Factory: First after 500 km; 450 cc GL60. Sec 6.3

  • Inspect chain and sprockets for wear (measure stretch)
    Final drive
    Factory

    Manual: Kette auf Verschleiss ueberpruefen. Factory: Remove, wash, inspect chain and link. Sec 6.9.2

Every 10,000 mi or 2 years

2 items
  • Compression test (or leak-down)
    Engine
    Guideline
  • Change fork oil
    Front end
    Guideline

    Some early telescopic forks are grease filled or use very small oil quantities. Check your manual.

Every 12,000 mi or 2 years

1 item
  • Grease swingarm pivot
    Rear suspension and frame
    Guideline

Every 12,000 mi or 3 years

1 item
  • Replace points and condenser
    Ignition and electrics
    Guideline

Every 15,000 mi

1 item
  • Replace brake linings / skim drums (wear based)
    Brakes
    Guideline

Every 18,000 mi

1 item
  • Replace chain and sprockets (wear based)
    Final drive
    Guideline

Every 20,000 mi or 4 years

2 items
  • Repack / replace steering head bearings
    Front end
    Guideline

    Many old machines use loose balls in cups and cones. Taper roller conversions are common.

  • Repack / replace wheel bearings
    Wheels and tires
    Guideline

    Cup-and-cone and taper roller hubs need periodic repacking and adjustment.

Every 25,000 mi or 6 years

1 item
  • Replace swingarm bushes / bearings
    Rear suspension and frame
    Guideline

Every 25,000 mi or 10 years

1 item
  • Magneto overhaul / re-magnetize, replace capacitor
    Ignition and electrics
    Guideline

    Weak spark when hot is the classic symptom. Old capacitors fail with age, not miles.

Every 30,000 mi or 6 years

1 item
  • Rebuild forks: seals, bushes, springs
    Front end
    Guideline

Every 6 months

1 item
  • Clean battery terminals, check charge and strap
    Ignition and electrics
    Guideline

Every 12 months

1 item
  • Check speedometer / odometer against a known distance
    Controls and cables
    Guideline

    Old speedos drift with tire size and drive wear. Use phone GPS over a measured 10 miles / km.

Every 2 years

1 item
  • Inspect frame, welds and lugs for cracks
    Rear suspension and frame
    Guideline

Every 4 years

1 item
  • Replace fuel lines
    Fuel and air
    Guideline

    Old rubber and modern ethanol fuel do not mix well.

Every 6 years

2 items
  • Replace inner tubes and rim tape with tires
    Wheels and tires
    Guideline
  • Replace tires on age (regardless of tread)
    Wheels and tires
    Guideline

Guideline lines: Intervals here are general guidelines for the machine's era and layout, compiled for this app. They are not factory manual figures. Check your workshop manual, and edit any interval in the bike's Schedule tab.

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